window.addEvent('load', function(){
	$('aaa').set('tween',{duration: 1000})

	if(!Cookie.read('fade')){
			$('aaa').get('tween').start('opacity',[0,1]).chain(function(){
				Cookie.write('fade',{duration: 0.1})
				$('centerbox').get('tween').start('margin-top',[245,0]).chain(function(){
					var ct = $('content_box');
					var sz = ct.getScrollSize();
					ct.setStyle('height',sz.y);
					ct.setStyle('margin-top',-sz.y);
					ct.get('tween').start('margin-top',[-sz.y,0]);
				});
			});
	}else{
		$('aaa').setStyle('opacity',1);
		$('centerbox').setStyle('margin-top',0);
		$('content_box').setStyle('margin-top',0);
	}

});